How to Maintain Scroll position after asynchronous postback in asp.net with in the nested master?

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may its a duplicate question what am asking but i want proper solution..

I have a child page with the nested master means 2 master pages inherit one from another..and in that child page i have all user controls only..

so in my case i have maintain scroll position of child page after async post back of user control list box.

i have tried

MaintainScrollPositionOnPostback="true"

with in page directive and js code

XML

<script type="text/javascript" >
           var xPos, yPos;
           var prm = Sys.WebForms.PageRequestManager.getInstance();
           prm.add_beginRequest(BeginRequestHandler);
           prm.add_endRequest(EndRequestHandler);
           function BeginRequestHandler(sender, args) {
               xPos = document.getElementById("<%=Panel1.ClientID %>").scrollLeft;
               yPos = document.getElementById("<%=Panel1.ClientID %>").scrollTop;
           }
           function EndRequestHandler(sender, args) {
               document.getElementById("<%=Panel1.ClientID %>").scrollLeft = xPos;
               document.getElementById("<%=Panel1.ClientID %>").scrollTop = yPos;
           }
 </script>

for panel and for div and update panel..these all are fails completely, why because if child page is getting post back means the related master pages also post backed..but i don't know how to maintain the scroll position..

try to help me as soon as possible..

thanks guys

Posted 28-Apr-14 2:38am

Sharath.Mitte

Updated 28-Apr-14 4:38am

Nelek

v3

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cyberfede2 · Accepted Answer · 2014-04-28T03:37:00

Hi Sharath.Mitte! xPos and yPos are javascript variables and they disappear on postback. You'll need to save in a hidden field.

Assuming you have an <asp:hiddenfield id="hid" runat="server"/>

var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_beginRequest(BeginRequestHandler);
prm.add_endRequest(EndRequestHandler);
function BeginRequestHandler(sender, args) {
xPos = document.getElementById("<%=Panel1.ClientID %>").scrollLeft;
yPos = document.getElementById("<%=Panel1.ClientID %>").scrollTop;
var h = document.getElementById("<%=hid.ClientID %>");
h.value = xPos.toString() + "_" + yPos.toString();
}
function EndRequestHandler(sender, args) {
var val = document.getElementById("<%=hid.ClientID %>").value.split('_');
xPos = parseFloat(val[0]);
yPos = parseFloat(val[1]);
document.getElementById("<%=Panel1.ClientID %>").scrollLeft = xPos;
document.getElementById("<%=Panel1.ClientID %>").scrollTop = yPos;

}
Regards